Speaker



FIG. 1 is a front perspective view of a speaker showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a rear perspective view thereof.

The broken line showing on FIGS. 1-2 and 4-5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a speaker, as shown and described. 